You can marshal duplicates, because the card did not state otherwise.
—
Madnico110/7/17

"Marshal a duplicate" is not a distinct player action. You initiate a "marshal a character/location/attachment" player action, and the card enters play as a duplicate. And while Marching Order is revealed, you cannot initiate the "marshal a location/attachment" player action. See the ruling on Arbor and duplicates, also the ruling on Barring the Gates.
—
mplain19510/7/17

A player with Marching Orders revealed can marshal locations, attachments, and events into shadows, and bring locations and attachments out of shadows. They cannot play the event from shadows, however.
—
scantrell2427196/22/18

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